<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
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  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    function revers(arr) {
      var newArr = []
      for(var i = arr.length - 1; i >= 0; i--) {
        newArr[newArr.length] = arr[i]
      }
      return newArr
    }

    console.log( revers(['q', 'w', 'e', 'r', 'd', 'f']) )
    
    console.log( revers(['www', 'qqqw', 'ffffe', 'r', 'd', 'f']) )
  </script>
</body>
</html>